Sewing machine



FIG. 1 is a front view of the sewing machine;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a front left perspective view thereof.

All broken lines shown are shown for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a sewing machine, as shown and described. 